Arc welding electrode



Aug- 29, 1950 P. BoURQUE m' AL 2,520,112

ARC WELDING ELECTRODE Filed April l2,4, 1948 2 Sheets-Sheet 1 Aug. 29,` 1950 P. BOURQUE Er AL 2,520,112

Anc WELDING ELECTRODE F11-ed April 24, 194s 2 Sheets-Sheet 2 Patented Aug. 29, 1950 WELDING ELECTRODE Pleilvlmu'qlle and Matt Klense. @eiwit Mich Anplication Aprill 24, 1948,l Serial No. 23,628

(o1.l zio-,fe

8 Qlaims.

our invention relates to a. new. andA useful improvement in an electrode. used. for aro` welding- .t is an object oi the present invention to pro.- vide an eleetrode- Comprising a pluralityv of rods or electrodes arranged. in close formation and connectedv to a terminal body at one. end and so arranged as to provide a hollow center.

Another object. of the. invention is.V the pro.n vision oan electrode having a plurality. of elee trodes or rods arranged in circular formation about a central core to provide. a hollow body.

Another ohect of the invention is. the. provision of an electrode oi this class comprising a pluralitf,7 o1- rods or; electrodes arranged in circular formation nested about a central core which may be dissipated when the weldingv oper.- ation is taking place.

Another object of the. invention is the provision ot an electrode whereby a high amperage may be used in the. weldingv operation and. a maX- irnurn amount of metal caused, to flow in a single operation.

Another object. of the. invention i-s the pro.- vision of an electrode so. arranged and construoted that while obtaining a maximum flow of metal the metal itself will be stabilized and prevented from flowing over an extensive area.

Another object of the invention is the provisionof an electrode havingv a 4strutture whereby a plurality of arcs will be present* and the arcing from one electrode orrod to another will be avoided. Y l

Other objects will appear hereinafter.

It is recognizedv that various Inodioations and changes may be made in the' detail ofy structure illustrated without departing 'troni the invention and it is intended that such shall be embraced within the scope of the claims which forni apart hereof...

Forining a part of this specification are drawinge ifi, Whiehr Fig. 1 is a side elevational` View of an electrode embodying. thinrentiea Fia 2 is. an end elevatipnalvievi 0i an electrode shownin Fig. 1, Y

Eig. 3 isa fragmentary View taken on line 3 3 et Fig. l, showing. parts in section and parts in Sie@ elevation,

Fig, 4 is an end elevational view of another form oi theV invention,

Fig. 5 is a fraglnentaryy View. taken on line 5-5 Qi. ne. 4;

Fig- 6, is an. end.. elevational. View 0i @eviter forrnof the invention i V f 'i is a sectional vien taken @e line. 1.,-1 of Fic 6:

' 81S an end eievaierlel View Of one form o5 the. invention,

Fie 91S ail end elevational, View of; one form @iii-.1.5,- 11i/@etica Similar i0 Fie. 8, with a slight variation,

10 is a Settieeal viewtaleel on. line ifi-fi@ 1l is a sigle elevational viewy of another forni of the invention with a part broken away arid a. rari. Shown in Section,

Fig. 12 is an end elevational; View` of; the form shown in li,

Fig? 1eB-is a side elevational View of a gripping terminal body,

l e. la is a side elevational view oi; another iQlmfOfthe. invention with parts. broken away and partsA shown in section,

Fig. 1 5' is a view similar to Fig. 8, with a slight @milice-tion,

In the form shown in Fig. l, we provide a plu.- ralitv` ot electrodes or metallic rods` i8 each of whieh. is covered with a covering i9 oi suitable insulating material commonly known as iiini. These rods, la are nested about a oei ral tube 2G which is also covered. with o, covering. of flux. A terminal 2i, which is formed from metal is provided with a hollow end 22 in which one end. oi thetube 2 0 engages. The eleotrode holder would gri-n the terminal 'v2-t inV the welding operation. In the welding operation the current would: then pass through the Central tube 2,8A and alsothrough the rodsv la as the` rods i3 are bared at their ends 8rd and free. trom flux and in closev engagement with the. Drietallioy terminal 2.1i.. At the operating. end oi the electrode there. is thus pro.- vided aA plurality of rods which are insulated from-l each other and inI spaced relation and these; rodsv are, positioned` about; the. central core 2i!Y Wil-.ith is hollow. Experience has shown that in operation a high amperage i i such an electredey and. the. flow; o; in eensiderably increased overv that whieh. can be. obtained when a. single electrode isusedg. Experienl hasY also?. shown that by navi-ng. the core 2li hellw e more efient Welding. operation @an be eifeoted. rI'hel sparking ofthe electrode rods at their arcing endsfzrgoni one totheotherisA avoided and as the welding operation continues the tube @will al1-e @Nausea- 159 melt. M li OTW- However, *thisl tube 2:5; will flow faster than the rodsl I3, so that the @el @i the tube. 2.9-

alivavs positioned fdlv. from. the 0 @latine endsofthe rods. la fiamme within the Space. Separating the rods and inwardly from their ends a sort of well in which the member 2|] is being melted so that there is virtually within the space at the operating ends of the rods I8 a fire box or furnace. 'I'his has the effect of heating the ends of the electrodes and facilitates their owing during the welding operation. Experience has also shown that this results in a stabilizing of the arc, that is the flow of the metal is concentrated over the area defined by the ends of the rods I8 and sputtering and spattering is reduced to a minimum thus retaining the flowed metal in the desired area.

In Fig. 4, we have shown a slight modification in which the rods 23 are provided with a covering 24 of flux excepting at one end. These rods 23 are positioned around a central tubular core 26 which is provided vwith a solid end 3| engaging in the socket 35 formed in the extension 28 of the terminal 27, this terminal 21 having a ilange 29 which may be welded or otherwise secured to the ends of the rod 23. In the space between the central tubular member 26 and the rod 23 we have inserted a powdered metal 25 such as powdered aluminum. Any suitable alloy may be used but it is preferred to use aluminum in that the aluminum will prevent oxidation. The forming of the chamber at the end of the electrode in which the central core 26 will be melted and in which the end of the powder aluminum 25 will also be melted is present as for the form shown in Fig. 1 with the same results so far as stabilizing the arc and facilitating and controlling the flow of the metal.

In Fig. 7, we have shown an electrode embodying the metallic tube 35 positioned around which are the rods 33 each of which is covered with a covering 343 of flux. These rods 33 are Welded by the weld El to the extending end of the tube 35 which projects outwardly beyond one end of the rods 33. The extending end of the tube 35 forms the terminal which is to be gripped by the electrode holder. It will be noted that the rod 35 terminates inwardly from the ends of the ro-ds 33 a slight distance and this is the distance that is usually maintained in an electrode holder of this size. When in operation tube 35 will be burning ci at its end inwardly from the ends of the electrode.

In Fig. 8, we have shown an electrode having a plurality of rods 38 each provided with a covering 39 and these coverings of iiux 39 amalgamating with each other as at 4@ so as to provide circular body having the cored center 4|. The terminal 43 is provided with the extension 42 which fits within one end of the bared ends of the rod and the ends of the rods 38 are welded to the terminal 43 by the weld 44. In Fig. 9, the structure is the same as shown in Fig. 8, excepting that instead of having ux around the rods in a layer a ring 45 of flux is formed around the rods 38-a to provide the central core itl- A.

In Fig. 11, we have shown the rods 46 provided with a covering 4l of iiux and positioned about a coil spring 48. The terminal 50 which is gripped by the electrode holder is provided with a iiange and an extension 49. YThis extension 49 may be threaded into one end of the spring 48 to serve as a retainer. It will be noted that the spring 48 also terminates inwardly from one end of the rods which would be the operating end and thus the inwardly positioned furnace or lire box s thus afforded with the advantages enumerated.

In Fig. 14, we have shown a slight modification in which the rods 52, each provided with a covering 53 of flux, are positioned about an outer spring 54 and in which is positioned an inner spring 55. The terminal 50 is provided with a iiange 5| where the extension is threaded into one end of the outer spring 54 and the central boss 56 is threaded into one end of the central spring 55. Again it will be noted that these springs terminate inwardly from one end of the rod for the advantages already mentioned.

In Fig. 15, we have shown a slight modiiication in which the rods SB-A are covered with a coating 39-A as shown in Fig. 8. Embracing this coating 39--A is a sheathing or skin 39B of very thin metal and preferable aluminum. Experience has shown that with a sheathing or skin 39B of aluminum the rods are more iirmly bound together and at the same time a deoxidizing agent is present during the welding operation, the aluminum sheathing or skin 39B being burned or fused at the same timethe rod is consumed.

With an electrode constructed in this manner the various advantages enumerated are obtained. Moreover in addition to the advantages set out, the deep penetration of the arc into the material operated upon is prevented and there is a more rapid and uniform spreading of the metal, with the result that thinner metals may be welded with a higher amperage than is customary Where a conventional type of electrode or rod is used.

What we claim as new is:

1. An electric arc welding electrode comprising an elongated hollow body; a plurality of welding electrodes positioned about said body in longitudinal alinement therewith; and means for electrically connecting one end of said electrodes to said body.

2. An electric arc welding electrode comprising an elongated hollow body; a plurality of welding electrodes positioned about said body in longitudinal alinement therewith; and means for electrically connecting one end of said welding electrodes to said body, said electrodes extending beyond one end of said body and said body at its opposite end extending beyond the end of said electrodes.

3. An electric arc welding electrode comprising an elongated hollow body; a plurality of welding electrodes positioned about said body in longitudinal alinement therewith; means for electrically connecting one end of said welding electrodes to said body, said electrodes extending beyond one end of said body and said body at its opposite end extending beyond the end of said electrodes; and insulating means for insulating said electrodes from each other and from said body throughout their major portion o the length.

4. An electric arc welding electrode comprising a tubular metallic body; a plurality of welding electrodes positioned around the periphery of said body in spaced relation to each other; a metallic extension on said body extending beyond one end of said electrodes to provide a gripping portion for an electrode holder; means for electrically connecting one end of said welding electrodes to said body, said electrodes projecting at their opposite ends beyond the adjacent end of said body.

5. An electric arc welding electrode comprising a tubular metallic body; a plurality of welding electrodes positioned in spaced relation around the periphery of said body and extending longitudinally thereof; a metallic gripping member on said body and electrically connected to one end of said electrodes and projecting outwardly from one end of said electrodes; and means for insulating said electrodes from each other.

6. An electric arc Welding electrode comprising a tubular metallic body; a plurality of welding electrodes positioned in spaced relation around the periphery of said body and extending longitudinally thereof; a metallic gripping member on said body and electrically connected to one end of said electrodes and projecting outwardly from said end oi said electrodes, said electrodes projecting at their other ends beyond the adjacent end of said tubular body.

7. An electric are welding electrode comprising a tubular metallic body; a plurality of Welding electrodes positioned in spaced relation around the periphery of said body and extending longitudinally thereof; a metallic gripping member on said body and electrically connected to one end of said electrodes and projecting outwardly from said end of said electrodes, said electrodes projecting at their other ends beyond the adjacent end of said tubular body, and an additional tubular member extending within the first named tubular member and electrically connected at one of its ends to said gripping member.

8. An electric arc welding electrode comprising a tubular metallic body; a plurality of Welding electrodes positioned inspaced relation around the periphery of said body and extending longitudinally thereof; a metallic gripping member on said body and electrically connected to one end of said electrodes and projecting outwardly from said end of said electrodes; and means for insulating said electrodes from each other, said f electrodes projecting at their other end beyond the adjacent end of said tubular body, and a sheathe of metal surrounding said electrodes for binding the same together.

PHILIP BOURQUE. MATT KIILUNEN. 

